Sapporo in September: weather, what to wear and what's on

Sapporo weather in September

Averages for 1991–2020 at the JMA's Sapporo station (17 m above sea level).

High

22.8°C (73°F)

Low

14.8°C (59°F)

Precipitation

142.2 mm

Wet days

10.2 days

Sunshine

159 hours

Highs fall 3.6°C from August and drop another 6.4°C into October.

That is 9.7°C above Sapporo's yearly average high of 13.1°C.

Of our 14 places with temperature records, Sapporo is the coldest in September, 1.0°C cooler than Kawaguchiko.

Of our 15 places, Sapporo gets the least precipitation in September: 10.6 mm less than Osaka.

Rain of 1 mm or more falls on 10.2 days, and 10 mm or more on 4.1 days.

Rain of 30 mm or more in one day falls on 1.3 days, and 50 mm or more on 0.6 days.

0.6 days reach 30°C or more.

The sun is out for 40% or more of the possible hours on 16.3 days, and 3.5 days have under 0.1 hours of sunshine.

By the JMA's cloud records, 1.8 days are clear and 11.2 are overcast.

On 15 September 2027 the sun rises at 5:13 and sets at 17:46 in Sapporo, giving 12 hours 33 minutes of daylight (NAOJ).

Average temperature

18.6°C (65°F)

Humidity

71%

Days of 25°C or more

7.5 days

Early, mid and late September

By the last ten days of September the average high in Sapporo is 4.1°C lower than in the first ten.

By ten-day totals, 1–10 September is the wettest (49.6 mm) and 21–30 September the driest (43.0 mm).

What to wear in Sapporo in September

Mild: highs around 22.8°C

• Long sleeves, or a T-shirt with a light jacket or cardigan.
• An umbrella: rain falls on 10.2 days.

Pack

• Umbrella

• Our clothing rules

Rainy season and typhoons

In an average September, 0.7 typhoons come within 300 km of the Hokkaido region; across Japan, 3.3 come within 300 km and 1.0 make landfall (JMA, 1991–2020).

September records in Sapporo

The extremes the JMA has measured in September at its Sapporo station.

Hottest September day

32.7°C (91°F) on 8 September 2020 (records since 1876); also on 2 September 1990

Coldest September night

−0.9°C (30°F) on 29 September 1906 (records since 1876)

Wettest September day

141.0 mm on 16 September 1998 (records since 1876)

Holidays and crowds in September

National holidays in September 2027:

• Mon 20 September — Respect for the Aged Day
• Thu 23 September — Autumnal Equinox Day

• Sat 18 September to Mon 20 September: 3 days off in a row

In September 2025, hotels and inns across Hokkaido were 67.4% full on average (4th busiest of 12 months). Foreign guests spent 709,390 nights there that month (Japan Tourism Agency). That compares with 69.5% in August and 63.2% in October.

• Japan in September: visitor numbers and busy travel days
• Holidays in September
• Silver Week

What's on in Sapporo in September

Sapporo before and after September

• Sapporo in August
• Sapporo in October
• All 12 months in Sapporo

Other places in September

• All 15 places in September

Related items

• Sapporo by month
• Japan in September
• Sapporo in August
• Sapporo in October